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1) Kill power to the branch circuit breaker and temporarily disconnect the LINE and LOAD wires from the T-Stat.

2) Set your meter to measure resistance (Ohm setting). If a 240 volt system, place 1 meter lead to one of the hot wires and the 2nd meter lead to the other hot wire. You should be able to read and measure resistance here. If able to measure resistance, that is a good reading.

3) Next step is to repeat the same process and measure resistance from each of the hot wires to the ground wire. There should be 0 Ohms here. If greater than 0 Ohms from each hot to ground, then there is a ground fault present in the floor mat conductors.

4) If the floor mat resistance values all measure OK, then most likely an issue with the T-Stat.

I will tell you that...the things you have to go through to be an Expert are quite rigorous.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.